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Discontinued Operations - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Discontinued Operations And Disposal Groups [Abstract] |  |  |  |  |  |
Impairment loss |  | $ 2,300,000 |  |  | $ 2,300,000 |
Operating income (loss) from discontinued operations | $ (21,000) | $ (84) | $ (268) | $ (215,000) | $ (373,000) | $ (350,000)
Operating assets sales agreement effective date |  |  |  |  | Aug. 14, 2014 |
Minimum lease period with option to purchase. |  |  |  |  | 1 year |

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